Flight number record
AS 1421
Alaska Airlines · Houston to Portland
- Route
- IAH → PDX
- Departs
- 18:19
- Flights
- 352
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 1421, check with Alaska Airlines.
AS 1421 lands a B, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 352 flights, with a median arrival 5 minutes early.
Key figures
On time
77.5%
Arrivals under 15 minutes late, of 347 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
1.14%
National rate is 1.89%
1 hour+ late
5.8%
National rate is 8.3%
These figures cover 352 flights between September 2025 and August 2026. The median arrival is 5 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When AS 1421 flies
AS 1421 flies IAH to PDX without a single fixed slot. Its most common scheduled departure was 18:19, used on 70 of 352 flights, with 17:57 (47 flights) and 17:55 (47 flights) next.
- Departs 18:1970 flights19.9%
- Departs 17:5747 flights13.4%
- Departs 17:5547 flights13.4%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 18:19 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and AS 1421 runs 10 points better at 77.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
AS 1421 next to IAH to PDX
Every carrier on IAH to PDX combined arrived on time 80.9% of the time across 1,209 flights, so AS 1421 is 3 points behind it. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 1421thin sample | 352 | 77.5% | 61 min | 1.14% | B |
| All Alaska Airlines on IAH–PDXthin sample | 353 | 77.6% | 61 min | 1.13% | B |
| All carriers on IAH–PDX | 1,209 | 80.9% | 62 min | 0.50% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 1421 quarter by quarter
AS 1421 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Jan–Mar 2026 at 71.8%, a swing of 15 points on roughly 70 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights86.7%
- Oct–Dec 202590 flights79.5%
- Jan–Mar 202679 flights71.8%
- Apr–Jun 202691 flights77.8%
- Jul–Sep 202662 flights77.0%
Scale runs 65% to 90%.
By weekday, AS 1421 did best on Monday at 83.0% on time and worst on Sunday at 70.6%. Each day rests on about 50 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 1421 runs when it is late
AS 1421 often beats the schedule: 88 of 347 completed flights, 25%, arrived 15 minutes or more early. The 78 late arrivals split 37 under half an hour, 21 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early88 flights25.4%
- Within 15 min181 flights52.2%
- 15–29 min late37 flights10.7%
- 30–59 min late21 flights6.1%
- 1–2 hours late8 flights2.3%
- 2+ hours late12 flights3.5%
Scale runs 0% to 100%.
Share of 347 completed flights by arrival against schedule.
A late pushback is often recovered here: of 93 departures that left 15 minutes late or more, 30 still arrived on time. 15 flights left on time and still arrived late.
The worst days
Worst days for AS 1421
The latest arrival of the period was on 23 October 2025, 4 hours 39 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 October 2025 | 4 hours 39 minutes | Carrier |
| 2 June 2026 | 4 hours 1 minute | Late-arriving aircraft |
| 15 October 2025 | 3 hours 41 minutes | Late-arriving aircraft |
| 24 November 2025 | 3 hours 27 minutes | Extreme weather |
| 20 November 2025 | 3 hours 24 minutes | Late-arriving aircraft |
Delay causes
Why AS 1421 runs late
Late-arriving aircraft accounts for 57% of the 4,761 delay minutes carriers reported here, and the remaining four split what is left.
- 57%Late-arriving aircraft
- 18%National Airspace System
- 14%Carrier
- 9%Extreme weather
- 2%Security
57% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,761 reported delay minutes here, that single category outweighs weather by 6 to one. The split is drawn from 4,761 delay minutes reported on AS 1421.
Cancellations sit at 1.14% against a national 1.89%, which is ordinary. Diversions add another 0.28%.
Connections and routes
What a delay on this flight costs
5.8% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
At 1,825 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 352 flights under AS 1421 in the data flew IAH to PDX. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 352 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking AS 1421
For a booking, read AS 1421 as 77.5% on time with 1.14% cancelled over 352 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- IAH to PDX, every carrier and departure
- PDX to IAH, the return direction
- United Airlines 740 on the same route86.8%
- United Airlines 1420 on the same route77.2%
- George Bush Intercontinental (IAH) delay statistics
- Portland International (PDX) delay statistics
- Alaska Airlines on-time record
- Every Alaska Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Alaska Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.